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Sept. 18 1923.

E. w. K. ROE

SAW'

2 Sheets-Sheet 1 Filed Dec.

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Sept. 18 1923.

E. W. K. ROE

SAW

Filed Dec. 12 1921 2 Sheet s-Sheet 2 Patented Sept. 18, 1923;

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, ent ement swa xs w seaaq s e QRE Be PNOR meant nae Ai men QOMIPANYLOF 141 SAW.

citizen of the; 7 United States, residing at .Ghicago, inthe cou'ntyof Cook: and FState of iIllinois,-have invented: certain new and use-. =tul Improvements in Saws, of which the fol- "lowing is aspecification. g

:My invention relates to sawsandhas for the cut alongstra ight lines 15 Further objects of the'invention Willbe c'omeappfaient asthe description 1sread mi;

longitudinal inclination :of respect to thework; A. 1 "Another object) of. the invention. is to so? direct the bladethat it will proceedthrough i I and. the edge its principal object to .preventlateral and Will feed equally at both ends.

connection with the accompanying drawing showing a selected embodiment ot the in- Fig.1 is aside elevation showing as muchas is necessary to? give a. clear understanding 1 of the 'applicatioirof the invention to a hack "saw foncuttingrails and the like; 1 f

Figs. 2,3,'-and*t are transverse SGCtlOIlSiOIl the lines 2 2, and respectively "of Fig. 1. r

I This embodiment of the invention includes a suitable frame or support carrying the upright memb'er's I0 and llconnectedeby the; 'guide rods-l2. 1 Each of the 11 is provided with a suitable which is secured a horizontal frame member uprights and bracket 13 to "14 extending'to' the right in Fig. l1 and: 1pro vi'ded' with plurality of perfprati0nsf'15 ':'adapted to receive *fa bolt '16 by which the tv'ork cla'mp117 may besecured in'the. desired -positio11"--tvith respect to thje saw. :As illustratcd, this clamp consists of a U shaped.

"screw '19; This construction is particularly "suitable for holding 'rails,but it-"Willbe u'nderstood that any suitable form of: clamp Y} be used. z 45 ttvo concentric flanges 25 and "26' adapted toi 'co-operate flanges 27 and 28 on equi ed With the "handle" 12 1." The front face of the cross head is provided with AboltiSO passing herblade lwith I flanges 26 and (2 8, and.

12, 1921. Serial No. 52;,e15.

One'end of a link ed to be received trated inFig. 2, tially the same diameter flange; 26, so as to form therewith,

29..f1he flange-27 is adapt- Within the flange asillusand area as the I aproper bearing as-is also indicated ig. 2.

through the cross-head and the. link and concentric with. the annular flanges serves to secure the flanges. 26. and :28 against separation; The opposite end of: the link 29 is equipped With annular fiangesi3l and 332 corresponding incallrespe cts to the flangesfQ? and'28 which co-operate in like manner with fianges33 and34on one endof a. saw frameiiti. A bolt 36 Passes through i the link and the saw framezat. the centerof the annularlflangesand secures the parts against separation .IThe saw frame .35 may be 7 of any suitable construction and 'may have any desired means for securing a blade :36; therein. 1 It is notintended that the bolts 30 andi86 .shall serve as pivots, but. that the complementary flanges 251and 27, and 31 and 33 shallform the pivotal bearings, the bolts 30 and 36 being relied upon merely to hold the 32 and Bi in. close contact. These larger flanges serve to. prevent any; lateral or inclined movement 01" the saw framewith respeetto the cross head. Of course substantially the same results can be obtained by making the annular bearings in the form of'discs rather than flanges, but the bearing area presented by the tlanges here disclosed is suflicient to. endure. the wear and permits the-use of less metal. The cross head 20"is provided on its rear side. With-a segment 37 of a gear secured thereto by screws 38, or in any:other manner and-the saw frame is equipped With a "similar segment secured. thereto by screws "40. These segments are of the same size and :have the same number of similar teeth. The. link 29 is provided adjacent to its center Witha boss .alforlning a'bearing for the fpintle 42 on which is mounteda gear 4.3 meshing with .the' segments 87 and '89. The boss 41 may be extended to form the bearing for the gear 43.ifdesiredyorthe; may "be. journa-led in any othersuitable manner. :Theb'road bearingsin the pivotal connections between the link and the cross .head

andfiangeQS is of substan-.

' cut.

sates-for the rotation ofthe link 529 and maintalns the saw frame the blade parallel to its original position.

With this construction positive feeding -mechan1sm wlll not ordinarily be needed as the engagement of the saw teeth with the work on the cutting stroke will cause the blade to be fed into the work automatically. I have also found that the blade moves easily on the return stroke without binding or dragging.

. without departing 'liclng any of the advantages thereof, and I I am aware that changes in the form and proportion of parts, and in the detalls of construction of my invention may be made from the spirit or sacrrreserve the right to makeall suchchanges as fairly fall within thescope of the following claims.

' ally connected to the saw at a I claim: 1 v 1. The combination of a saw, means pivot single'point for "supporting the saw in operative position and permitting it to feed through the work by a 1 rotary movement, the saw feeding equally throughout its entire length and meansfor causing said saw to feed through a series of "parallel positions.

2. The combination of a saw, rotatable "means for directing said saw, and means for causing said saw to feed equally throughout its length, said several means being operatively connected to said saw through a single common pivotal axis. e

3. The combination of a saw, means for 1 directing said saw including an element piv- 1 oted thereto and adapted to rotateabout a re.

ciprocating axis constrained to move in a path substantially parallel to the path in which the saw reciprocates, and means to." cause said saw to feed equally at all points in;

its length. i

l. The combinat on of a saw, reciprocating means pivotally connected with said saw,

'means for guiding said reciprocating means,

1 in a straight line, and means to maintain said head,

saw substantially parallel :tosaid guiding 5. The combination'of a reciprocating cross:

head, means for reciprocating said cross an elementadapted ,to rotate relative to saw,

pivoted to said saw, and

said cross head and and direct it in straight lines 35 and consequently head and said saw,

means" for guiding said cross head, a.

means for constraining said saw to feed equally throughout its length.

.6. The combination of a saw, directing means. for said saw adapted to rotate about a reciprocating axis, an element fixed with respect to said axis, an element fixed with re- .spect to said saw, and gearing between said elements adapted to constrain said saw to feed equally at all points in its length.

"7. The combination of a reciprocating cross head. a saw having a blade, a link pivotally connected with said cross head and said saw,

and gearing between said crosshead-and Said saw adapted to constrain said blade to feed equally in all points in its length.

8. The combination of a reciprocating cross head, a saw having a blade, a link pivoted to both said cross head and said saw, a gear fixed to said cross head, a gear fixed to said saw, and a gear moving withsaid link and meshing with said fixed gear. v

9. The combination of a cross head, a saw,

a link pivotally connectedto both said cross head and said saw, the connections between said link "and saidcros s head and said link and said saw embodying broad circular bearings to prevent lateral movementof said sawzj' relative to said cross head,;the radii of said hearings on the link approximately equaling the distance between the pivotalcenters: of the link.

.10. The combination a link pivotally connected to both saidcross embodying auxiliary bearing surfaces distant from thepivotal-a'Xis so asto prevent lateral movement of said saw relative to said crosshead, the link .beingadapted to contact 'saidbearing surfaces.

11. The comblnation of a cross head hav ing a broad bearing surface thereon, a saw having: a broad bearing surface, thereon, a link pivotally connected to vbothsaid cross head and said saw and having corresponding broad bearing surfaces co-operating with the .bearingsurfaces on said .crosshead and said of a cross head, a saw,'

the pivotal connections saw to preventrelative lateral movement 7 thereof, the bearing surfaces onthe link being approXimatelyas-broad as the distance between thepivotal centers of the link will permit. j.

12. The combination of a crosshead having annular bearing-surfaces, a saw having annular bearingsurfaces, and a link pivot-' ally connected to the cross head and the saw having annular bearing sur faces-complemental to "the bearing surfaces on said cross;

head and sa'idsaw andco-operating therewith to prevent relative lateral movement of I said cross head and said saw, said annular bearings being concentricwith the pivotal centers of the link. v 1

' 13. The combination of across head, a saw, a linkpivotally connected to said; cross head and said saw, the pivotal connections embodying broad bearing surfaces adapted to prevent relative lateral movement of said cross head and said saw, a gear fixed With respect to said cross head, agear fixed with 5 respect to said saw, and a gear carried by said link and meshing with said fixed gears. 14. The combination of a reciprocating cross head, a saw having a blade, a link pivotally connected with said cross head and said saw, and means including a member r'otatably mounted upon the link for constraining said blade to feed equally at all points in its length.

EMIL W. K. ROE. 

